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Bmr springs are red and hotchkis springs are grey, I called hotchkis and they told me fronts are 1.5.. tire sizes are front 265/35/18 and rear is 275/35/18
According to the Hotchkis website their springs are a 1" drop. Did you tell them you had a 4th gen camaro, not a 5th gen?
Also, get some 275/35's on the front, that will help as well.
OP: I was just reading through this thread and thought I would tell you those C6's look good on your car. Normally, I am not a big fan of them, but they look good on your car!